8L90 T87A won't accelerate in drive/reverse

[vance580]

I cannot get my truck to move when hitting the gas. I have a used T87A that is unlocked and was programmed by HP Tuners and I have also tried a fresh new blank T87A I programmed with an MDI. Neither TCM will do anything when I hit the gas pedal in drive or reverse. This is a swap project so I am not sure what else to try. I have tried fast relearns as well. Has anyone encountered this and actually gotten a solution?

[joe111599]

Have you tried reflashing the TCM? Mine wouldn't move after a trans relearn until I loaded TCM again.

[vance580]

Did you reflash with the MDI or HP Tuners? I am going to try the unlocked again using the MDI tomorrow.